JPH066810Y2 - The vertebral body fixing plate - Google Patents

The vertebral body fixing plate

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Publication number
JPH066810Y2
JPH066810Y2 JP13819389U JP13819389U JPH066810Y2 JP H066810 Y2 JPH066810 Y2 JP H066810Y2 JP 13819389 U JP13819389 U JP 13819389U JP 13819389 U JP13819389 U JP 13819389U JP H066810 Y2 JPH066810 Y2 JP H066810Y2
Authority
JP
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Grant
Patent type
Prior art keywords
fixing
vertebral body
screw
portion
threaded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP13819389U
Other languages
Japanese (ja)
Other versions
JPH0375717U (en )
Inventor
聡 小島
浩巳 松▲崎▼
Original Assignee
旭光学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/809Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with bone-penetrating elements, e.g. blades or prongs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7059Cortical plates
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8625Shanks, i.e. parts contacting bone tissue

Description

【考案の詳細な説明】 「技術分野」 本考案は、上下の椎体、特に脊椎椎体を固定する際に用いる椎体固定用プレートに関する。 Description of invention "Technical Field 'This invention is, upper and lower vertebral bodies, in particular to the vertebral body fixing plates to be used for fixing the vertebral.

「従来技術およびその問題点」 例えば胸−腰椎体の一つが損傷した場合、その損傷椎体を除去した後、損傷椎体の代わりに移植骨または人工骨を挿入し、その上下の椎体間を、何らかの椎体固定器具で機械的に固定する手術が行なわれる。 "Prior art and Issues" eg breast - when one of the lumbar body is damaged, after removing the damaged vertebral body, inserting the bone graft or artificial bone in place of the damaged vertebral body, between the vertebral body and below and mechanically fixed to surgery for some vertebral body fixing device is performed. このため従来、 For this reason conventional,
椎体固定器具が使用されてきた。 Vertebral body fixed instruments have been used. このような椎体固定器具として必要な条件は、薄いこと、固定器具と椎体を固定するスクリューが緩まないこと、椎体に固定器具が密着すること、および手術が簡単であることがあげられる。 Necessary conditions as such vertebral body fixing instrument, thinner, the screw for fixing the fixing device and the vertebral bodies does not loosen, and the like can be fixed instrument vertebral bodies are in close contact, and surgery is simple .

ところで従来の椎体固定器具として、接続すべき上下の椎体にまず椎体プレートを打ち込むとともにねじ固定し、次にこの椎体プレート間を別の複数の固定ねじおよびナットで固定するものが知られている。 Meanwhile as a conventional vertebral body fixing tool, screws and fixed with first implanting vertebral plates above and below the vertebral body to be connected, then Stationary between the vertebral plates by another plurality of fixing screws and nuts are known It is. この椎体固定器具は、上記〜の条件については優れている。 The vertebral body fixing device is excellent in the conditions of the ~. しかし、の手術の簡単さという点では、若干問題があった。 However, in terms of simplicity of the surgery, there was some problem. つまり固定ねじをナットを用いて椎体プレートの側面から固定するには、小型のスパナを繰り返しナットに着脱させるという時間のかかる作業を必要とする。 That is fixed from the side of the vertebral body plate with the fixing screw nut, it requires time consuming tasks that is removably Again nut small spanner. さらに固定ねじは、ねじりに対する抵抗力が弱いため、これを通常2本用い、その2本の固定ねじ間を別のねじれ防止器具で接続しなければならない。 Further fixing screw, since resistance to torsion is weak, which usually used two, must be connected between the two fixing screws in a different anti-twist device. 接続作業に時間を要することは、明らかに術者および患者の苦痛を増加させる。 It takes time to connect the work causes clearly surgeon and increase the patient's pain.

「考案の目的」 本考案は、このような従来の椎体固定器具についての問題意識に基づき、より簡単な作業で上下の椎体間の接続ができる椎体固定用プレートを得ることを目的とする。 The present invention, "the purpose of the invention" is a purpose of this based on the awareness of the conventional vertebral body fixing device to obtain a vertebral body fixing plate with a simpler operation can connect between the upper and lower vertebral bodies to.
また本考案は、椎体との固定強度およびねじりに対する強度がともに強い椎体固定用プレートを得ることを目的とする。 The present invention aims at securing strength and strength against twisting between vertebral bodies obtain both strong vertebral body fixing plate.

「考案の概要」 本考案は、一連の板状体からなる固定プレートの両端部に、それぞれ椎体への固定部を設け、この椎体固定部にそれぞれねじ孔を形成し、このねじ孔に挿入する固定ねじに、該ねじ孔に螺合する螺合ねじ部と、椎体内に進入する進入ねじ部とを設け、かつこの進入ねじ部のねじピッチP1を螺合ねじ部のねじピッチP2より大きく(P1>P2) The present invention, "invented Overview" is at both ends of the fixing plate consisting of a series of plate-shaped body, respectively provided fixing portions to the vertebral body, respectively to form a threaded hole in the vertebral body fixing portion, into the screw hole a fixing screw to be inserted, screwed threaded portion screwed into said threaded hole, and a penetration screw portion that enters the vertebral body is provided, and the thread pitch of the threaded screw portion of the screw pitch P1 of the entrance thread portion P2 larger (P1> P2)
としたことを特徴としている。 It is characterized in that the content was.

このようにねじピッチを設定すると、固定ねじの進入ねじ部が椎体に螺合し、かつ螺合ねじ部が固定プレートのねじ孔に螺合した状態において、該固定ねじを回動させると、進入ねじ部の進行量の方が螺合ねじ部の進行量より多くなり、その結果、固定プレートが強固に椎体に固定される。 With this setting the thread pitch, entrance thread of the fixing screw is screwed into the vertebral bodies, and in a state in which the threaded screw portion is screwed into the threaded hole of the fixing plate, rotates the said fixing screws, towards the progress of ingress threaded portion is larger than the traveling amount of screwing the screw portion, resulting in the fixed plate is fixed to firmly vertebral body. また板状の固定プレートは、ねじりに強い。 The plate-like fixing plate, resistant to torsion.

「考案の実施例」 以下図示実施例について本考案を説明する。 The present invention will be described below shown examples "Example of invention." 第1A〜1 The 1A~1
C図は本考案による固定プレート10を示し、第2A〜 C Figure shows the fixed plate 10 according to the present invention, the 2A~
2C図は固定ねじ20を示す。 2C drawing shows the fixing screws 20.

固定プレート10は、全体として平板状をしており、その両端部に、コーナ部を円弧とした略矩形の椎体固定部11を有する。 Fixed plate 10 has a overall flat plate shape, both ends thereof, with a substantially rectangular vertebral body fixing portion 11 in which the corner arc. この椎体固定部11には、その裏面に厚肉部12が一体に形成されており、この厚肉部12に、 The vertebral body fixing portion 11 is thick-walled portion 12 is formed integrally on the rear surface, to the thick portion 12,
先端の尖った固定突起13が突出形成されている。 It pointed fixing protrusion 13 of the tip is formed to project.

椎体固定部11にはそれぞれ、略矩形状の椎体固定部1 Each of the vertebral body fixing portion 11, a rectangular substantially vertebral body fixing section 1
1の対角線方向に離隔した一対のねじ孔14,15が形成されている。 A pair of screw holes 14, 15 spaced one diagonal direction are formed. この一対のねじ孔14,15はそれぞれ、第1B、1D図に示すように、椎体固定部11の平面方向と直交する方向に対し、椎体固定部11の内側に向けて傾斜(この実施例では約10゜)している。 Each pair of screw holes 14 and 15, first 1B, as shown in 1D view, with respect to a direction perpendicular to the planar direction of the vertebral body fixing portion 11, inclined towards the inside of the vertebral body fixing portion 11 (this embodiment the example is about 10 °). そしてこのねじ孔14とねじ孔15のねじピッチはP2であり、 The thread pitch of the screw hole 14 and screw hole 15 is P2,
例えば1.5mm(p1.5)のピッチが設定される。 For example the pitch of 1.5 mm (P1.5) is set.

固定ねじ20は、頭部の大径の螺合ねじ部21と、これに続く小径の進入ねじ部22とを有する。 Fixing screw 20 has a threaded screw portion 21 of the large diameter of the head, and a small-diameter entry threaded portion 22 subsequent thereto. 螺合ねじ部2 Screwing the screw part 2
1はねじ孔14,15に螺合されるもので、従ってそのねじピッチP2は、ねじ孔14,15と同じであり、上述の例に従って、例えば1.5mm(p1.5)に形成されている。 1, there is screwed into the screw holes 14 and 15, so that its screw pitch P2 is the same as the screw holes 14 and 15 are formed in accordance with the above example, for example, 1.5 mm (P1.5) .
これに対し、進入ねじ部22は、このピッチP2より大きいねじピッチP1(P1>P2)に形成されている。 In contrast, entry threaded portion 22 is formed in the pitch P2 larger than thread pitch P1 (P1> P2). このピッチ This pitch
P1は例えば、1.75mm(p1.75)に設定される。 P1 is for example, is set to 1.75mm (p1.75). またこの進入ねじ部22は、第2B図に示すように、引き抜きに強い形状をした医療用ねじとして形成されている。 Also this approach threaded portion 22, as shown in FIG. 2B is formed as a medical screw in which the strong shape withdrawal. なお螺合ねじ部21の端部には、第2C図に示すように六角レンチの挿入孔23が形成されている。 Note that an end portion of the threaded screw portion 21, the insertion hole 23 of the hexagonal wrench as shown in 2C diagram is formed.

なお固定プレート10および固定ねじ20は、例えばチタン系合金から構成することができ、さらに必要に応じ、その表面にアパタイト等の生体親和性の材料をコーティングすることができる。 Note fixing plate 10 and fixing screws 20, for example can be composed of a titanium-based alloy, if necessary, can be coated biocompatible material apatite on its surface.

上記構成の本椎体固定用プレートは、第3図に示すように用いられる。 This vertebral body fixing plates of the above configuration is used as shown in Figure 3. 損傷した脊椎椎体の部位に、移植骨(または人工骨)30を挿入し、この移植骨30の上下の脊椎椎体31に、それぞれ固定プレート10の椎体固定部11を合致させる。 The site of damaged vertebral body by inserting the bone graft (or artificial bone) 30, and below the spine vertebral body 31 of the bone graft 30, to match the vertebral body fixing portion 11 of the fixed plate 10, respectively. この状態において、椎体固定部11 In this state, the vertebral body fixing portion 11
を軽く叩いてその固定突起13を脊椎椎体31に進入させ、仮止めすることができる。 The flicking the fixed protrusion 13 is advanced into the spinal vertebral body 31 can be temporarily fixed. 次に、ねじ孔14とねじ孔15にそれぞれ固定ねじ20を進入させ、レンチ挿入孔23に挿入した六角レンチによりねじ込み方向に回転させる。 Then, to enter the respective fixing screws 20 into screw hole 14 and screw hole 15, it is rotated in the screwing direction by the inserted hex wrench wrench insertion hole 23. すると進入ねじ部22が脊椎椎体31内に進入し、やがて螺合ねじ部21がねじ孔14,15に螺合する。 Then enter threaded portion 22 enters into the spinal vertebral body 31, it is screwed into the threaded screw portion 21 screw holes 14, 15 before long. この状態において、さらに固定ねじ20をねじ込み方向に回転させると、螺合ねじ部21と進入ねじ部22 In this state, when the further rotation of the fixing screw 20 threadedly direction, it enters a threaded screw portion 21 screw portion 22
のピッチの差により、固定ねじ20の単位回転角当たりの進入ねじ部22の進行量の方が、螺合ねじ部21のそれより大きくなる。 The difference in pitch, towards the progression of ingress threaded portion 22 per unit rotation angle of the fixing screw 20 is larger than that of the threaded screw portion 21. このため、固定プレート10が強固に脊椎椎体31に結合される。 Therefore, the fixing plate 10 is firmly coupled to the spinal vertebral body 31.

ねじ孔14と15の傾斜は、脊椎椎体31内に位置する神経束32に固定ねじ20が干渉しないようにするために設定されたものである。 The inclination of the screw holes 14 and 15 are those fixing screws 20 to the nerve bundle 32 located within the spinal vertebral body 31 is set in order not to interfere. 従って、このねじ孔14と1 Therefore, this screw hole 14 1
5の傾斜は、固定プレート10および椎体固定部11の形状、該ねじ孔14,15の位置等の要素に応じ、適宜設定することができる。 Inclination of 5, the shape of the fixing plate 10 and the vertebral bodies fixing unit 11, according to factors such as the position of the screw holes 14 and 15 can be appropriately set.

以上の作業は、固定ねじ20をその頭部のレンチ挿入孔23に嵌めた六角レンチによって回転させることによって行なうことができるから、非常に作業性がよく、短時間で行なうことができる。 More work, because it can be performed by rotating the fitting hexagonal wrench wrench insertion hole 23 of the head of the fixing screw 20, very good workability is can be performed in a short time. また平板状の固定プレート1 The plate-shaped fixing plate 1
0は、ねじりに強い断面形状であるから、固定プレート10がねじれ変形するおそれは皆無である。 0, since a strong cross-sectional shape in torsion, a possibility that the fixing plate 10 to torsional deformation is none.

「考案の効果」 以上のように本考案の椎体固定用プレートは、両端に椎体固定部を有する固定プレートと、この椎体固定部に形成したねじ孔に螺合させる固定ねじとからなるものであって、固定ねじには、ピッチが大小に異なる進入ねじ部と螺合ねじ部が形成されており、進入ねじ部が椎体内に、螺合ねじ部が固定プレートのねじ孔にそれぞれ螺合されるものであるから、ピッチの違いにより、固定プレートを強固に椎体に固定することができる。 "Effect of invention" or higher as in the present invention vertebral body fixing plate consists of a stationary plate having a vertebral body fixing portion at both ends, the fixing screws screwed into threaded holes formed in the vertebral body fixing portion It is those, the fixing screw, the pitch has a different approach threaded portion is screwed a screw portion formed on the large and small, the entrance thread portion vertebral body, screwing the screw portions, respectively the threaded holes of the fixing plate since it is intended to be screwed, it can be the difference in pitch, rigidly fixed to the vertebral fixation plate. またその固定作業は、固定ねじをその頭部を介して回動させて行なうことができるから、非常に作業性がよく、従って手術を簡単にすることができる。 Further the fixing operation, since the fixing screw can be done by rotating through the head, very good workability, and thus it is possible to simplify the surgery. さらに請求項2に記載の椎体固定用プレートによれば、固定ねじが椎体内の神経を損傷するおそれをなくすことができる。 Furthermore, according to the vertebral body fixing plate according to claim 2, it is possible to eliminate the possibility of fixing screws from damaging the nerve within the vertebral body.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1A〜1D図は本考案の椎体固定用プレートの固定プレートを示すもので、第1A図は平面図、第1B、1D The 1A~1D figure shows the vertebral body fixing plates of the fixing plate of the present invention, Figure 1A is a plan view, a 1B, 1D
図はそれぞれ第1A図のB−B線、D−D線に沿う断面図、第1C図は第1A図のC−C線に沿う断面を含む正面図である。 Figure line B-B of Figure 1A respectively, sectional view taken along line D-D, Figure 1C is a front view including a section taken along the line C-C of Figure 1A. 第2A〜2C図は固定ねじを示すもので、第2A図は平面図、第2B図は、第2A図の上面図、第2C図は進入ねじ部の拡大図、 第3図は本考案の椎体固定用プレートの使用態様を示す正面図である。 The 2A~2C figure shows a fixing screw, Figure 2A is a plan view, Figure 2B is a top view of FIG. 2A, the 2C figure enlarged view of the entrance thread portion, FIG. 3 is the present invention it is a front view showing a mode of use of the vertebral body fixing plates. 10……固定プレート、11……椎体固定部、12…… 10 ...... fixed plate, 11 ...... vertebral body fixing section, 12 ......
厚肉部、13……固定突起、14,15……ねじ孔、2 Thick wall portion, 13 ...... fixing protrusions 14,15 ...... screw hole, 2
0……固定ねじ、21……螺合ねじ部、22……進入ねじ部、23……レンチ挿入孔、30……移植骨、31… 0 ...... fixing screws, 21 ...... screwing the threaded portion, 22 ...... entering the threaded portion, 23 ...... wrench insertion hole, 30 ...... bone graft, 31 ...
…脊椎椎体、32……神経束。 ... spine vertebral body, 32 ...... nerve bundles.

Claims (2)

    【実用新案登録請求の範囲】 [Range of utility model registration request]
  1. 【請求項1】固定プレートの両端部に、それぞれ椎体への固定部を設け、 この椎体固定部にそれぞれねじ孔を形成し、 このねじ孔に挿入する固定ねじに、該ねじ孔に螺合する螺合ねじ部と、椎体内に進入する進入ねじ部とを設け、 At both ends of claim 1 fixing plate, respectively provided with fixing portions to the vertebral body, respectively to form a threaded hole in the vertebral body fixing portion, the fixing screw to be inserted into the screw holes, threaded into the screw hole and screwing the threaded portion that case, the entry threaded portion enters the vertebral body is provided,
    かつこの進入ねじ部のねじピッチ(P1)を螺合ねじ部のねじピッチ(P2)より大きく(P1>P2)したことを特徴とする椎体固定用プレート。 And vertebral body fixing plates, characterized in that the thread pitch of the entrance thread portion (P1) was greater than the thread pitch (P2) of the screwed threaded part (P1> P2).
  2. 【請求項2】請求項1において、固定プレートのねじ孔は、固定ねじが椎体内の神経束位置を避けるべく、固定プレートの平面方向と直交する方向に対して傾斜している椎体固定用プレート。 2. The method of claim 1, screw holes of the fixing plate, so fixing screws avoid nerve bundles located within the vertebral body, inclined to that vertebral body fixed with respect to the direction perpendicular to the planar direction of the fixing plate use plate.
JP13819389U 1989-11-29 1989-11-29 The vertebral body fixing plate Active JPH066810Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13819389U JPH066810Y2 (en) 1989-11-29 1989-11-29 The vertebral body fixing plate

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP13819389U JPH066810Y2 (en) 1989-11-29 1989-11-29 The vertebral body fixing plate
US07619492 US5147361A (en) 1989-11-29 1990-11-29 Vertebral connecting plate
DE19904038082 DE4038082C2 (en) 1989-11-29 1990-11-29 Vertebral joint assembly

Publications (2)

Publication Number Publication Date
JPH0375717U true JPH0375717U (en) 1991-07-30
JPH066810Y2 true JPH066810Y2 (en) 1994-02-23

Family

ID=15216256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13819389U Active JPH066810Y2 (en) 1989-11-29 1989-11-29 The vertebral body fixing plate

Country Status (3)

Country Link
US (1) US5147361A (en)
JP (1) JPH066810Y2 (en)
DE (1) DE4038082C2 (en)

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US5147361A (en) 1992-09-15 grant
DE4038082C2 (en) 1993-11-11 grant
JPH0375717U (en) 1991-07-30 application
DE4038082A1 (en) 1991-06-06 application

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